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The term "cavity" refers to a hollow space or depression within a solid object. It can be found in various contexts, including geological, biological, and engineering fields. In geology, a cavity can refer to a void within a rock formation, often formed by the dissolution of minerals or the extraction of minerals. In biology, cavities are common in organisms, such as the nasal cavity in humans, which houses the nasal passages and sinuses. In engineering, cavities are designed into structures to serve specific purposes, such as the combustion chamber in an internal combustion engine or the cavity in a microwave oven for heating food. The size, shape, and purpose of a cavity can vary widely depending on its application.